Small changes by businesses and consumers can make a big difference in saving the lives of animals worldwide, said Wayne Pacelle, chief executive of the Humane Society of the United States.
"If we just reduce our meat consumption by 15 percent, we'd save a billion animals," he told CNBC's "Squawk Box" on Wednesday.
"It's an incremental process of enlightening people. There's so many issues ... animals raised for food, there's testing, there's wildlife management issues, the Cecil issue — the trophy hunting, there's dog fighting, there's cock fighting. I mean everything under the sun," he said.
The Cecil issue refers to the prized African lion whose death at the hands of an American hunter last year sparked international outrage. Walter Palmer, a 55-year-old dentist from Minnesota, allegedly paid $50,000 to hunt the animal.